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-rw-r--r--fs/overlayfs/copy_up.c4
-rw-r--r--fs/overlayfs/dir.c46
-rw-r--r--fs/overlayfs/export.c2
-rw-r--r--fs/overlayfs/namei.c24
-rw-r--r--fs/overlayfs/ovl_entry.h9
-rw-r--r--fs/overlayfs/super.c5
6 files changed, 53 insertions, 37 deletions
diff --git a/fs/overlayfs/copy_up.c b/fs/overlayfs/copy_up.c
index 143c52de97ec..9e5223108362 100644
--- a/fs/overlayfs/copy_up.c
+++ b/fs/overlayfs/copy_up.c
@@ -192,7 +192,7 @@ static int ovl_set_timestamps(struct dentry *upperdentry, struct kstat *stat)
{
struct iattr attr = {
.ia_valid =
- ATTR_ATIME | ATTR_MTIME | ATTR_ATIME_SET | ATTR_MTIME_SET,
+ ATTR_ATIME | ATTR_MTIME | ATTR_ATIME_SET | ATTR_MTIME_SET | ATTR_CTIME,
.ia_atime = stat->atime,
.ia_mtime = stat->mtime,
};
@@ -741,7 +741,7 @@ static int ovl_copy_up_meta_inode_data(struct ovl_copy_up_ctx *c)
struct path upperpath, datapath;
int err;
char *capability = NULL;
- ssize_t uninitialized_var(cap_size);
+ ssize_t cap_size;
ovl_path_upper(c->dentry, &upperpath);
if (WARN_ON(upperpath.dentry == NULL))
diff --git a/fs/overlayfs/dir.c b/fs/overlayfs/dir.c
index 8c89eaea1583..fe88ac18ad93 100644
--- a/fs/overlayfs/dir.c
+++ b/fs/overlayfs/dir.c
@@ -557,28 +557,42 @@ static int ovl_create_or_link(struct dentry *dentry, struct inode *inode,
goto out_revert_creds;
}
- err = -ENOMEM;
- override_cred = prepare_creds();
- if (override_cred) {
+ if (!attr->hardlink) {
+ err = -ENOMEM;
+ override_cred = prepare_creds();
+ if (!override_cred)
+ goto out_revert_creds;
+ /*
+ * In the creation cases(create, mkdir, mknod, symlink),
+ * ovl should transfer current's fs{u,g}id to underlying
+ * fs. Because underlying fs want to initialize its new
+ * inode owner using current's fs{u,g}id. And in this
+ * case, the @inode is a new inode that is initialized
+ * in inode_init_owner() to current's fs{u,g}id. So use
+ * the inode's i_{u,g}id to override the cred's fs{u,g}id.
+ *
+ * But in the other hardlink case, ovl_link() does not
+ * create a new inode, so just use the ovl mounter's
+ * fs{u,g}id.
+ */
override_cred->fsuid = inode->i_uid;
override_cred->fsgid = inode->i_gid;
- if (!attr->hardlink) {
- err = security_dentry_create_files_as(dentry,
- attr->mode, &dentry->d_name, old_cred,
- override_cred);
- if (err) {
- put_cred(override_cred);
- goto out_revert_creds;
- }
+ err = security_dentry_create_files_as(dentry,
+ attr->mode, &dentry->d_name, old_cred,
+ override_cred);
+ if (err) {
+ put_cred(override_cred);
+ goto out_revert_creds;
}
put_cred(override_creds(override_cred));
put_cred(override_cred);
-
- if (!ovl_dentry_is_whiteout(dentry))
- err = ovl_create_upper(dentry, inode, attr);
- else
- err = ovl_create_over_whiteout(dentry, inode, attr);
}
+
+ if (!ovl_dentry_is_whiteout(dentry))
+ err = ovl_create_upper(dentry, inode, attr);
+ else
+ err = ovl_create_over_whiteout(dentry, inode, attr);
+
out_revert_creds:
revert_creds(old_cred);
return err;
diff --git a/fs/overlayfs/export.c b/fs/overlayfs/export.c
index 19574ef17470..984df246962e 100644
--- a/fs/overlayfs/export.c
+++ b/fs/overlayfs/export.c
@@ -274,7 +274,7 @@ static int ovl_encode_fh(struct inode *inode, u32 *fid, int *max_len,
return FILEID_INVALID;
dentry = d_find_any_alias(inode);
- if (WARN_ON(!dentry))
+ if (!dentry)
return FILEID_INVALID;
type = ovl_dentry_to_fh(dentry, fid, max_len);
diff --git a/fs/overlayfs/namei.c b/fs/overlayfs/namei.c
index f47c591402d7..625da4bc8d0f 100644
--- a/fs/overlayfs/namei.c
+++ b/fs/overlayfs/namei.c
@@ -200,7 +200,7 @@ static int ovl_lookup_single(struct dentry *base, struct ovl_lookup_data *d,
int err;
bool last_element = !post[0];
- this = lookup_one_len_unlocked(name, base, namelen);
+ this = lookup_positive_unlocked(name, base, namelen);
if (IS_ERR(this)) {
err = PTR_ERR(this);
this = NULL;
@@ -208,8 +208,6 @@ static int ovl_lookup_single(struct dentry *base, struct ovl_lookup_data *d,
goto out;
goto out_err;
}
- if (!this->d_inode)
- goto put_and_out;
if (ovl_dentry_weird(this)) {
/* Don't support traversing automounts and other weirdness */
@@ -659,7 +657,7 @@ struct dentry *ovl_get_index_fh(struct ovl_fs *ofs, struct ovl_fh *fh)
if (err)
return ERR_PTR(err);
- index = lookup_one_len_unlocked(name.name, ofs->indexdir, name.len);
+ index = lookup_positive_unlocked(name.name, ofs->indexdir, name.len);
kfree(name.name);
if (IS_ERR(index)) {
if (PTR_ERR(index) == -ENOENT)
@@ -667,9 +665,7 @@ struct dentry *ovl_get_index_fh(struct ovl_fs *ofs, struct ovl_fh *fh)
return index;
}
- if (d_is_negative(index))
- err = 0;
- else if (ovl_is_whiteout(index))
+ if (ovl_is_whiteout(index))
err = -ESTALE;
else if (ovl_dentry_weird(index))
err = -EIO;
@@ -693,7 +689,7 @@ struct dentry *ovl_lookup_index(struct ovl_fs *ofs, struct dentry *upper,
if (err)
return ERR_PTR(err);
- index = lookup_one_len_unlocked(name.name, ofs->indexdir, name.len);
+ index = lookup_positive_unlocked(name.name, ofs->indexdir, name.len);
if (IS_ERR(index)) {
err = PTR_ERR(index);
if (err == -ENOENT) {
@@ -708,9 +704,7 @@ struct dentry *ovl_lookup_index(struct ovl_fs *ofs, struct dentry *upper,
}
inode = d_inode(index);
- if (d_is_negative(index)) {
- goto out_dput;
- } else if (ovl_is_whiteout(index) && !verify) {
+ if (ovl_is_whiteout(index) && !verify) {
/*
* When index lookup is called with !verify for decoding an
* overlay file handle, a whiteout index implies that decode
@@ -1139,7 +1133,7 @@ bool ovl_lower_positive(struct dentry *dentry)
struct dentry *this;
struct dentry *lowerdir = poe->lowerstack[i].dentry;
- this = lookup_one_len_unlocked(name->name, lowerdir,
+ this = lookup_positive_unlocked(name->name, lowerdir,
name->len);
if (IS_ERR(this)) {
switch (PTR_ERR(this)) {
@@ -1156,10 +1150,8 @@ bool ovl_lower_positive(struct dentry *dentry)
break;
}
} else {
- if (this->d_inode) {
- positive = !ovl_is_whiteout(this);
- done = true;
- }
+ positive = !ovl_is_whiteout(this);
+ done = true;
dput(this);
}
}
diff --git a/fs/overlayfs/ovl_entry.h b/fs/overlayfs/ovl_entry.h
index 28348c44ea5b..8d81e88f1d1e 100644
--- a/fs/overlayfs/ovl_entry.h
+++ b/fs/overlayfs/ovl_entry.h
@@ -27,6 +27,7 @@ struct ovl_sb {
};
struct ovl_layer {
+ /* ovl_free_fs() relies on @mnt being the first member! */
struct vfsmount *mnt;
/* Trap in ovl inode cache */
struct inode *trap;
@@ -37,6 +38,14 @@ struct ovl_layer {
int fsid;
};
+/*
+ * ovl_free_fs() relies on @mnt being the first member when unmounting
+ * the private mounts created for each layer. Let's check both the
+ * offset and type.
+ */
+static_assert(offsetof(struct ovl_layer, mnt) == 0);
+static_assert(__same_type(typeof_member(struct ovl_layer, mnt), struct vfsmount *));
+
struct ovl_path {
struct ovl_layer *layer;
struct dentry *dentry;
diff --git a/fs/overlayfs/super.c b/fs/overlayfs/super.c
index f5cf0938f298..fcf453f7f4ae 100644
--- a/fs/overlayfs/super.c
+++ b/fs/overlayfs/super.c
@@ -263,8 +263,8 @@ static int ovl_sync_fs(struct super_block *sb, int wait)
return 0;
/*
- * If this is a sync(2) call or an emergency sync, all the super blocks
- * will be iterated, including upper_sb, so no need to do anything.
+ * Not called for sync(2) call or an emergency sync (SB_I_SKIP_SYNC).
+ * All the super blocks will be iterated, including upper_sb.
*
* If this is a syncfs(2) call, then we do need to call
* sync_filesystem() on upper_sb, but enough if we do it when being
@@ -1710,6 +1710,7 @@ static int ovl_fill_super(struct super_block *sb, void *data, int silent)
sb->s_xattr = ovl_xattr_handlers;
sb->s_fs_info = ofs;
sb->s_flags |= SB_POSIXACL;
+ sb->s_iflags |= SB_I_SKIP_SYNC;
err = -ENOMEM;
root_dentry = d_make_root(ovl_new_inode(sb, S_IFDIR, 0));
generated by cgit 1.2.3-korg (git 2.39.0) at 2024-05-29 06:09:19 +0000